package android_serialport_api;

import android.util.Log;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class SerialPort {
    private static final String TAG = "SerialPort";

    private FileDescriptor mFd;
    private FileInputStream mFileInputStream;
    private FileOutputStream mFileOutputStream;

    public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {
        if (!device.canRead() || !device.canWrite()){
            try{
                Log.v("Serial Port", "can not read or write");
                Process su = Runtime.getRuntime().exec("/system/xbin/su");
                String cmd = "/system/bin/chmod 777" + device.getAbsolutePath() + "\n" + "exit\n";
                //Process su = Runtime.getRuntime().exec(cmd);
                su.getOutputStream().write(cmd.getBytes());

//                if ((su.waitFor() != 0) || !device.canRead() || !device.canWrite()){
//                    throw new SecurityException();
//                }
            }catch (Exception e){
                e.printStackTrace();
                throw new SecurityException();
            }
        }

        mFd = open(device.getAbsolutePath(), baudrate, flags);

        if (mFd == null){
            Log.e(TAG, "native return null");
            throw new IOException();
        }

        mFileInputStream = new FileInputStream(mFd);
        mFileOutputStream = new FileOutputStream(mFd);
    }

    public InputStream getInputStream(){
        return mFileInputStream;
    }

    public OutputStream getOutputStream(){
        return mFileOutputStream;
    }

    private native static FileDescriptor open(String path, int baudrate, int flags);

    public native void close();

    static {
        System.loadLibrary("serial_port");
    }
}
